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Nanoimprinting Solution-Derived Barium Titanate for Electro-Optic Metasurfaces
Helena C Weigand1, Ülle-Linda Talts1, Anna-Lydia Vieli1
1ETH Zurich, Department of Physics, Institute for Quantum Electronics, Optical Nanomaterial Group, Auguste-Piccard-Hof 1, 8093 Zurich, Switzerland.
Nano Letters
|April 24, 2024
Summary
Researchers developed novel electro-optic metasurfaces using barium titanate. These metasurfaces enable fast, efficient optical modulation at low voltages, promising advancements in free-space optical devices.
Area of Science:
- Photonics and Materials Science
- Nanotechnology and Optics
Background:
- Electro-optic metasurfaces offer potential for high-speed free-space optical devices.
- Barium titanate's electro-optic properties are desirable but limited by thin-film fabrication challenges.
Purpose of the Study:
- To fabricate active metasurfaces using a cost-effective, bottom-up approach with polycrystalline barium titanate.
- To enhance light-matter interaction and electro-optic modulation through resonant phenomena.
Main Methods:
- Utilized an etch-free, sol-gel based bottom-up fabrication process for polycrystalline barium titanate metasurfaces.
- Achieved strong hybrid Mie/surface lattice resonances with a quality-factor of 200 at 633 nm.
- Demonstrated electro-optic modulation of metasurface transmission.
Main Results:
- Fabricated barium titanate metasurfaces with electro-optic coefficients comparable to bulk lithium niobate.
- Achieved resonant enhancement of the Pockels effect, boosting modulation amplitude by two orders of magnitude.
- Demonstrated electro-optic modulation at frequencies up to 5 MHz with applied voltages below 1 V.
Conclusions:
- The developed nanoimprinted barium titanate metasurfaces enable efficient, low-voltage, high-speed electro-optic modulation.
- This breakthrough facilitates the development of low-cost, large-scale free-space optical modulators and tunable metalenses.
